help us. help us try to be better. >> reporter: and at one point, courageous community leaders join us, like the legendary nba star isiah thomas, who says with so many good people caring so much, there has to be hope. >> 95% of the people in our communities are good, decent, hard working people. >> reporter: but as you'll learn, 24 hours after this meeting, one of the gang members was shot six times. but back in the room, all together, watching, hoping, ralph and so many others. including a little boy named christian, who had a poem we asked him to read. >> i want to go outside and play. but i can't. not because i have no friends, it's because of the violence. it seems it never ends. >> and, again, an unprecedented event on "nightline" tonight. and not just a window into chicago, but so many cities near you. >>> and still ahead, right here on "world news," watch out. facebook could be ruining the chance your kid will be accepted to college. and the shocking things students are doing to each ot